I doubt a direct exit would work, as it has too much political support by liberals.
So a better way to start is to encourage Beijing and Moscow to build their own UN headquarters, then to propose that the UN move to one, then to the other, in a rotation cycle. Being out of the US for 50 years would give us a lot of time to figure out how to leave. And there would be far fewer supporters in the US after a while.
If it was still untenable after 50 years, we could propose that India and some cities in Africa and South America could also host.
yefragetuwrabrumuy: I doubt a direct exit would work, as it has too much political support by liberals.The GOP controls the House, Senate, and White House. Plus the President-elect is negative toward the UN. Perfect time.